East Stump Lake
Nelson County, North DakotaView mapDirections
ND DEQ publishes the water-quality measurements for East Stump Lake. Here is what has been measured.
- Limited data
East Stump Lake in Nelson County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Water clarity: 8.5 ft visibility. Chlorophyll-a (algae): 37.9 µg/L.
East Stump Lake is a lake in Nelson County, North Dakota. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2025-10-13. Methodology: how these readings are compared.
Vrbo is where to look for cabins and lake homes around East Stump Lake, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether East Stump Lake is safe to swim in today is a call for the North Dakota Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for East Stump Lake
These are the measurements ND DEQ publishes for East Stump Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.5 ft. Chlorophyll-a 37.9 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 37.9µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about East Stump Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
East Stump Lake typically sits around 52°F at the surface in October. Summer average is about 63°F. Usually warmest in Jul (about 70°F) and coldest in May (about 43°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (43°F) to its warmest (70°F).
Typical surface water temperature by month, from 18 field readings (2020–2025) via the EPA Water Quality Portal. See the full East Stump Lake water temperature breakdown →
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Stays near East Stump Lake
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Fishing East Stump Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Phosphorus
Worsening+30.25 µg/L/yr4 years
Chlorophyll-a
Improving-6.43 µg/L/yr4 years
Nearby Lakes in Nelson County
Frequently asked questions about East Stump Lake
Where is East Stump Lake?
- East Stump Lake is a lake in Nelson County, North Dakota. Its water-quality measurements are published by ND DEQ and shown on this page as reported.
What is the water quality of East Stump Lake?
- East Stump Lake in Nelson County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Water clarity: 8.5 ft visibility. Chlorophyll-a (algae): 37.9 µg/L.
Is East Stump Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of East Stump Lake?
- East Stump Lake typically sits around 52°F at the surface in October, from 18 EPA Water Quality Portal field readings (2020–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
17 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX17 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
- 4500 NO3 E ~ Nitrate in Water- Cadmium Reduction
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.